domain

The set of values of the independent variable, x, for which the functionf(x) is defined; the set of values of the dependent variable
is called the range. For example, let the
function by y = x2, with x restricted
to 0, 1, 2, 3, -3, and -5. Then y takes the values 0, 1, 4, 9,
and 25 respectively. The domain is [0, 1, 2, 3, -3, -5] and the range is
[0, 1, 4, 9, 25].